如题所述
第1个回答 2021-01-04
简便计算:
61×61-61
=61×61-61×1
=61×(61-1)
=61×60
=3660
61×61-61
=61×61-61×1
=61×(61-1)
=61×60
=3660
第2个回答 2021-01-05
61x61-61
=60×61
=60x60+60
=3600+60
=3660
=60×61
=60x60+60
=3600+60
=3660
如题所述
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